Following the first mass drowning of refugees in Mediterranean waters in 2013, United Nations Secretary General Ban Ki-moon called on the international community to "take action to prevent such tragedies in the future."
Two years into the refugee crisis — leaders are still holding meetings to work out how to avoid a "humanitarian catastrophe."
Meanwhile, nearly 800,000 refugees, asylum seekers and economic migrants have arrived in Europe already this year. And more than three million is expected to arrive by the end of next year.